6BK5

Inactive choanoflagellate E3 ubiquitin ligase Cbl TKB


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.401 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.167 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Phosphorylation control of the ubiquitin ligase Cbl is conserved in choanoflagellates.

Amacher, J.F.Hobbs, H.T.Cantor, A.C.Shah, L.Rivero, M.J.Mulchand, S.A.Kuriyan, J.

(2018) Protein Sci. 27: 923-932

  • DOI: 10.1002/pro.3397

  • PubMed Abstract: 
  • Cbl proteins are E3 ubiquitin ligases specialized for the regulation of tyrosine kinases by ubiquitylation. Human Cbl proteins are activated by tyrosine phosphorylation, thus setting up a feedback loop whereby the activation of tyrosine kinases trigg ...

    Cbl proteins are E3 ubiquitin ligases specialized for the regulation of tyrosine kinases by ubiquitylation. Human Cbl proteins are activated by tyrosine phosphorylation, thus setting up a feedback loop whereby the activation of tyrosine kinases triggers their own degradation. Cbl proteins are targeted to their substrates by a phosphotyrosine-binding SH2 domain. Choanoflagellates, unicellular eukaryotes that are closely related to metazoans, also contain Cbl. The tyrosine kinase complement of choanoflagellates is distinct from that of metazoans, and it is unclear if choanoflagellate Cbl is regulated similarly to metazoan Cbl. Here, we performed structure-function studies on Cbl from the choanoflagellate species Salpingoeca rosetta, and found that it undergoes phosphorylation-dependent activation. We show that S. rosetta Cbl can be phosphorylated by S. rosetta Src kinase, and that it can ubiquitylate S. rosetta Src. We also compared the substrate selectivity of human and S. rosetta Cbl by measuring ubiquitylation of Src constructs in which Cbl-recruitment sites are placed in different contexts with respect to the kinase domain. Our results indicate that for both human and S. rosetta Cbl, ubiquitylation depends on proximity and accessibility, rather than being targeted toward specific lysine residues. Our results point to an ancient interplay between phosphotyrosine and ubiquitin signaling in the metazoan lineage. This article is protected by copyright. All rights reserved.


    Organizational Affiliation

    Department of Molecular and Cell Biology, University of California, Berkeley, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Ubiquitin Ligase Cbl
A
349Salpingoeca rosetta (strain ATCC 50818 / BSB-021)Mutation(s): 0 
Find proteins for F2UL73 (Salpingoeca rosetta (strain ATCC 50818 / BSB-021))
Go to UniProtKB:  F2UL73
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.401 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.167 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 115.251α = 90.00
b = 115.251β = 90.00
c = 68.777γ = 120.00
Software Package:
Software NamePurpose
Aimlessdata scaling
PHASERphasing
XDSdata reduction
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Jane Coffin Childs Memorial Fund for Medical ResearchUnited StatesPostdoctoral fellowship

Revision History 

  • Version 1.0: 2018-03-14
    Type: Initial release
  • Version 1.1: 2018-05-09
    Type: Data collection, Database references